<template>
  <div class="app-container">
    讲师表单

    <!--查询表单-->
    <el-form :inline="true" class="demo-form-inline">
      <el-form-item>
        <el-input v-model="courseQuery.title" placeholder="课程标题" />
      </el-form-item>

      <!-- 一级分类 -->
      <el-form-item label="课程类别">
        <el-select
          v-model="courseQuery.subjectParentId"
          placeholder="请选择"
          @change="subjectLevelOneChanged"
        >
          <el-option
            v-for="subject in subjectOneList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"
          />
        </el-select>

        <!-- 二级分类 -->
        <el-select v-model="courseQuery.subjectId" placeholder="请选择">
          <el-option
            v-for="subject in subjectTwoList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"
          />
        </el-select>
      </el-form-item>

      <!-- 讲师 -->
      <el-form-item>
        <el-select v-model="courseQuery.teacherId" placeholder="请选择讲师">
          <el-option
            v-for="teacher in teacherList"
            :key="teacher.id"
            :label="teacher.name"
            :value="teacher.id"
          />
        </el-select>
      </el-form-item>

      <el-button type="primary" icon="el-icon-search" @click="fetchData()"
        >查询</el-button
      >
      <el-button type="default" @click="resetData()">清空</el-button>
    </el-form>

    <!-- 表格 -->
    <el-table
      v-loading="listLoading"
      :data="list"
      element-loading-text="数据加载中"
      border
      fit
      highlight-current-row
      row-class-name="myClassList"
    >
      <el-table-column label="序号" width="70" align="center">
        <template slot-scope="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>

      <el-table-column label="课程信息" width="470" align="center">
        <template slot-scope="scope">
          <div class="info">
            <div class="pic">
              <img :src="scope.row.cover" alt="scope.row.title" width="150px" />
            </div>
            <div class="title">
              <a href="">{{ scope.row.title }}</a>
              <p>{{ scope.row.lessonNum }}课时</p>
            </div>
          </div>
        </template>
      </el-table-column>

      <el-table-column label="创建时间" align="center">
        <template slot-scope="scope">
          {{ scope.row.gmtCreate.substr(0, 10) }}
        </template>
      </el-table-column>
      <el-table-column label="发布时间" align="center">
        <template slot-scope="scope">
          {{ scope.row.gmtModified.substr(0, 10) }}
        </template>
      </el-table-column>

      <el-table-column label="价格" width="100" align="center">
        <template slot-scope="scope">
          {{
            Number(scope.row.price) === 0
              ? "免费"
              : "¥" + scope.row.price.toFixed(2)
          }}
        </template>
      </el-table-column>
      <el-table-column
        prop="buyCount"
        label="付费学员"
        width="100"
        align="center"
      >
        <template slot-scope="scope"> {{ scope.row.buyCount }}人 </template>
      </el-table-column>
      <el-table-column label="状态" align="center">
        <template slot-scope="scope">
          {{ scope.row.status === "Draft" ? "未发布" : "已发布" }}
        </template>
      </el-table-column>

      <el-table-column label="操作" width="150" align="center">
        <template slot-scope="scope">
          <router-link :to="'/course/info/' + scope.row.id">
            <el-button type="text" size="mini" icon="el-icon-edit"
              >编辑课程信息</el-button
            >
          </router-link>
          <router-link :to="'/course/chapter/' + scope.row.id">
            <el-button type="text" size="mini" icon="el-icon-edit"
              >编辑课程大纲</el-button
            >
          </router-link>
          <el-button
            type="text"
            @click="removeCourseById(scope.row.id)"
            class="my-red"
            size="mini"
            icon="el-icon-delete"
            >删除</el-button
          >
        </template>
      </el-table-column>
    </el-table>

    <el-pagination
      @size-change="updatePageNum"
      @current-change="fetchData"
      :current-page="page"
      :page-sizes="[10, 20, 30, 50]"
      :page-size="limit"
      style="padding: 30px 0; text-align: center"
      layout="total, sizes, prev, pager, next, jumper"
      :total="total"
    >
    </el-pagination>
  </div>
</template>


<script>
import teacherApi from "@/api/edu/teacher/teacher";
import courseApi from "@/api/edu/course/course";
import subjectApi from "@/api/edu/subject/subject";
export default {
  data() {
    return {
      listLoading: true, // 是否显示loading信息
      list: null, // 数据列表
      total: 0, // 总记录数
      page: 1, // 页码
      limit: 10, // 每页记录数
      courseQuery: {
        subjectParentId: "",
        subjectId: "",
        title: "",
        teacherId: "",
      },
      subjectOneList: [],
      subjectTwoList: [],
      teacherList: [],
    };
  },
  created() {
    this.initTeacherList();
    this.getOneSubject();
    this.fetchData();
  },
  methods: {
    updatePageNum(limit = 10) {
      this.limit = limit;
      console.log(limit);
      this.fetchData();
    },
    removeCourseById(id) {
      this.$confirm(
        "此操作将永久删除该课程，以及该课程下的章节和视频，是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      )
        .then(() => {
          return courseApi.removeCourse(id);
        })
        .then(() => {
          this.fetchData();
          this.$message({
            type: "success",
            message: "删除成功!",
          });
        })
        .catch((response) => {
          // 失败
          if (response === "cancel") {
            this.$message({
              type: "info",
              message: "已取消删除",
            });
          }
        });
    },
    fetchData(page = 1) {
      // 调用api层获取数据库中的数据
      //console.log('加载列表')
      // 当点击分页组件的切换按钮的时候，会传输一个当前页码的参数page
      // 解决分页无效问题
      this.page = page;
      this.listLoading = true;
      courseApi
        .getPageListSearch(this.page, this.limit, this.courseQuery)
        .then((response) => {
          // debugger 设置断点调试
          if (response.success === true) {
            this.list = response.data.rows;
            this.total = response.data.total;
          }
          this.listLoading = false;
        });
    },

    initTeacherList() {
      teacherApi.getAll().then((response) => {
        this.teacherList = response.data.items;
      });
    },

    getOneSubject() {
      subjectApi.getAll().then((response) => {
        this.subjectOneList = response.data.items;
      });
    },
    subjectLevelOneChanged(value) {
      for (let i = 0; i < this.subjectOneList.length; i++) {
        //
        if (value === this.subjectOneList[i].id) {
          this.courseQuery.subjectId = "";
          this.subjectTwoList = this.subjectOneList[i].children;
          //this.courseQuery.subjectId = "";
          break;
        }
      }
    },

    resetData() {
      this.courseQuery = { subjectId: "" };
      this.subjectTwoList = []; // 二级分类列表
      this.fetchData();
    },
  },
};
</script>
<style scoped>
.myClassList .info {
  width: 450px;
  overflow: hidden;
}
.myClassList .info .pic {
  width: 150px;
  height: 90px;
  overflow: hidden;
  float: left;
}
.myClassList .info .pic a {
  display: block;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}
.myClassList .info .pic img {
  display: block;
  width: 100%;
}
.myClassList td .info .title {
  width: 280px;
  float: right;
  height: 90px;
}
.myClassList td .info .title a {
  display: block;
  height: 48px;
  line-height: 24px;
  overflow: hidden;
  color: #00baf2;
  margin-bottom: 12px;
}
.myClassList td .info .title p {
  line-height: 20px;
  margin-top: 5px;
  color: #818181;
}
.my-red {
  color: red;
}
</style>